Establishing an Optimized Caco-2/THP-1 Co-Culture Model to Efficiently Simulate Inflammatory Bowel Disease In Vitro
Gilda Parsamanesh1,2, Kaveh Baghaei2,3, Nima Rezaei1,4,5
1Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
Avicenna Journal of Medical Biotechnology
|July 17, 2026
Summary
This study optimized a Caco-2/THP-1 co-culture model for Inflammatory Bowel Disease (IBD) research. The improved model effectively mimics intestinal inflammation, offering a valuable tool for studying IBD pathogenesis and therapies.
Area of Science:
- Gastroenterology and Immunology
- In vitro modeling for disease research
Background:
- Inflammatory Bowel Disease (IBD) pathogenesis and targeted therapies require further elucidation.
- Existing in vitro models like organoids and cytokine-stimulated Caco-2 monolayers have limitations in fully representing IBD.
- The Caco-2/THP-1 co-culture model offers a practical approach to study intestinal epithelial and immune cell interactions but needs optimization.
Purpose of the Study:
- To optimize the Caco-2/THP-1 co-culture model for better mimicking intestinal inflammation.
- To determine optimal culture timing and treatment conditions for enhanced inflammatory response.
- To establish a more accurate in vitro system for IBD research.
Main Methods:
- THP-1 monocytes were differentiated into macrophage-like cells (M0) using PMA.
- M0 cells were stimulated with varying Lipopolysaccharide (LPS) concentrations for 6 or 24 hours to identify optimal inflammatory conditions.
- Inflammatory macrophages (M1) were co-cultured with differentiated or undifferentiated Caco-2 monolayers, with gene expression (IL-6, IL-8, TNF-α), M1 markers (CD86/HLA-DR), and nitric oxide production analyzed.
Main Results:
- Optimal M1 macrophage induction was achieved with 100 ng/ml LPS stimulation for 6 hours, resulting in 58.9% CD86+/HLA-DR+ macrophages and maximal nitric oxide production (179.3 μM).
- Co-culture with these optimized M1 macrophages significantly enhanced IL-8 and modestly increased IL-6 expression in differentiated Caco-2 cells.
- The differentiated Caco-2/THP-1 co-culture demonstrated a robust inflammatory response relevant to IBD.
Conclusions:
- The optimized differentiated Caco-2/THP-1 co-culture model effectively replicates intestinal inflammation characteristic of IBD.
- This enhanced model provides a valuable and practical tool for future investigations into IBD pathogenesis and therapeutic strategies.
- Optimization of culture timing and inflammatory agent exposure is crucial for accurate in vitro modeling of IBD.
